Commercially-viable unabridged books weren't possible until about 2004. In the same year, we got: An abridged version of "Vulcan's Soul, Book 1: Exodus" by Josepha Sherman and Susan Shwartz, read by Boyd Gaines, published by Simon & Schuster Audioworks, 2004, 240 min. Abridged by George Truett. (Sales were seemingly insufficient to go ahead with the next two books.) and unabridged, read by Richard Poe, published by Recorded Books, 2004, 510 min. At around $46 each, they were prohibitively expensive at the time. IIRC, you could buy access to the download and create your own compact discs. but the new tech allowed them to go ahead with the sequel books in 2006 and 2007. Amazon eventually took on distribution of the Recorded Books' unabridged titles, slashing prices for the three "Vulcan's Soul" instalments to $12-$25 each. Options included keeping a digital file, burning the downloads to CD, or purchasing the ten-disk sets that were pressed mainly for public libraries and visually-impaired communities. Last time I looked, these files for those books were no longer available. By S&S Audio wasn't in the unabridged Trek market at the time. Now, if an abridged "Star Trek" title was to come out today, sure, it would be considered "half-assed", but pre-2004, Simon & Schuster Audioworks were doing excellent work. That helped to drive the consumer interest in audio books.